What do you call the guys that complain about non stock cars?

Riff Raff said

I've posted this here before but, for this very reason a friend of mine removed the fender tag off his pro street roadrunner and replaced it with a fender tag that simply said "FU" (only not abbreviated).

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Wish I'd of thought of that when we raced a 72 Satellite as a 71 440 6bbl Road Runner in NHRA Stock Eliminator. *** wipes would look at our car in the pits and go to the VIN. Mumble to their buddy and walk away. I guess we should've butchered an original car.